php实现使用正则将文本中的网址转换成链接标签_php技巧

复制代码代码如下：

函数text2links($str='') {
    if($str=='' 或 !preg_match('/(http|www.|@)/i', $str)) { return $str; } }
    $lines =explode("n", $str); $new_text = '';
    while (列表($k,$l) = every($lines)) {
        // 替换链接：
        $l = preg_replace("/([ t]|^)www./i", "\1http://www.", $l);
        $l = preg_replace("/([ t]|^)ftp./i", "\1ftp://ftp.", $l);
        $l = preg_replace("/(http://[^ )rn!] )/i",
            "\1">\1>", $l);
        $l = preg_replace("/(https://[^ )rn!] )/i",
            "\1">\1>", $l);
        $l = preg_replace("/(ftp://[^ )rn!] )/i",
            "\1">\1>", $l);
        $l = preg_replace(
            "/([-a-z0-9_] (.[_a-z0-9-] )*@([a-z0-9-] (.[a-z0-9-] ) ))/i",
            "mailto:\1">\1>", $l);
        $new_text .= $l."n";
    }
    返回 $new_text;
}